package cn.tac.test.mybatis.typehandler;

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author : tac
 * @since : 04/09/2017
 */
//mybatis通过jdbc type和java type确定唯一handler
@MappedJdbcTypes(JdbcType.VARCHAR)  //这个handler会覆盖掉原有的VARCHAR对应的String类型的handler
public class MyStringTypeHandler extends BaseTypeHandler<String> {
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, parameter);
    }

    @Override
    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return wrapStr(rs.getString(columnName));
    }

    @Override
    public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return wrapStr(rs.getString(columnIndex));
    }

    @Override
    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return wrapStr(cs.getString(columnIndex));
    }

    private String wrapStr(String str) throws SQLException {
        return "$" + str;
    }
}
